ex/ex_shell.c

   1 /*-
   2  * Copyright (c) 1992, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  * Copyright (c) 1992, 1993, 1994, 1995, 1996
   5  *      Keith Bostic.  All rights reserved.
   6  *
   7  * See the LICENSE file for redistribution information.
   8  */
   9
  10 #include "config.h"
  11
  12 #ifndef lint
  13 static const char sccsid[] = "$Id: ex_shell.c,v 10.38 1996/08/19 21:52:54 bostic Exp $ (Berkeley) $Date: 1996/08/19 21:52:54 $";
  14 #endif /* not lint */
  15
  16 #include <sys/param.h>
  17 #include <sys/queue.h>
  18 #include <sys/wait.h>
  19
  20 #include <bitstring.h>
  21 #include <errno.h>
  22 #include <limits.h>
  23 #include <signal.h>
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <unistd.h>
  28
  29 #include "../common/common.h"
  30
  31 static const char *sigmsg __P((int));
  32
  33 /*
  34  * ex_shell -- :sh[ell]
  35  *      Invoke the program named in the SHELL environment variable
  36  *      with the argument -i.
  37  *
  38  * PUBLIC: int ex_shell __P((SCR *, EXCMD *));
  39  */
  40 int
  41 ex_shell(sp, cmdp)
  42         SCR *sp;
  43         EXCMD *cmdp;
  44 {
  45         int rval;
  46         char buf[MAXPATHLEN];
  47
  48         /* We'll need a shell. */
  49         if (opts_empty(sp, O_SHELL, 0))
  50                 return (1);
  51
  52         /*
  53          * XXX
  54          * Assumes all shells use -i.
  55          */
  56         (void)snprintf(buf, sizeof(buf), "%s -i", O_STR(sp, O_SHELL));
  57
  58         /* Restore the window name. */
  59         (void)sp->gp->scr_rename(sp, NULL, 0);
  60
  61         /* If we're still in a vi screen, move out explicitly. */
  62         rval = ex_exec_proc(sp, cmdp, buf, NULL, !F_ISSET(sp, SC_SCR_EXWROTE));
  63
  64         /* Set the window name. */
  65         (void)sp->gp->scr_rename(sp, sp->frp->name, 1);
  66
  67         /*
  68          * !!!
  69          * Historically, vi didn't require a continue message after the
  70          * return of the shell.  Match it.
  71          */
  72         F_SET(sp, SC_EX_WAIT_NO);
  73
  74         return (rval);
  75 }
  76
  77 /*
  78  * ex_exec_proc --
  79  *      Run a separate process.
  80  *
  81  * PUBLIC: int ex_exec_proc __P((SCR *, EXCMD *, char *, const char *, int));
  82  */
  83 int
  84 ex_exec_proc(sp, cmdp, cmd, msg, need_newline)
  85         SCR *sp;
  86         EXCMD *cmdp;
  87         char *cmd;
  88         const char *msg;
  89         int need_newline;
  90 {
  91         GS *gp;
  92         const char *name;
  93         pid_t pid;
  94
  95         gp = sp->gp;
  96
  97         /* We'll need a shell. */
  98         if (opts_empty(sp, O_SHELL, 0))
  99                 return (1);
 100
 101         /* Enter ex mode. */
 102         if (F_ISSET(sp, SC_VI)) {
 103                 if (gp->scr_screen(sp, SC_EX)) {
 104                         ex_emsg(sp, cmdp->cmd->name, EXM_NOCANON);
 105                         return (1);
 106                 }
 107                 (void)gp->scr_attr(sp, SA_ALTERNATE, 0);
 108                 F_SET(sp, SC_SCR_EX | SC_SCR_EXWROTE);
 109         }
 110
 111         /* Put out additional newline, message. */
 112         if (need_newline)
 113                 (void)ex_puts(sp, "\n");
 114         if (msg != NULL) {
 115                 (void)ex_puts(sp, msg);
 116                 (void)ex_puts(sp, "\n");
 117         }
 118         (void)ex_fflush(sp);
 119
 120         switch (pid = vfork()) {
 121         case -1:                        /* Error. */
 122                 msgq(sp, M_SYSERR, "vfork");
 123                 return (1);
 124         case 0:                         /* Utility. */
 125                 if ((name = strrchr(O_STR(sp, O_SHELL), '/')) == NULL)
 126                         name = O_STR(sp, O_SHELL);
 127                 else
 128                         ++name;
 129                 execl(O_STR(sp, O_SHELL), name, "-c", cmd, NULL);
 130                 msgq_str(sp, M_SYSERR, O_STR(sp, O_SHELL), "execl: %s");
 131                 _exit(127);
 132                 /* NOTREACHED */
 133         default:                        /* Parent. */
 134                 return (proc_wait(sp, (long)pid, cmd, 0, 0));
 135         }
 136         /* NOTREACHED */
 137 }
 138
 139 /*
 140  * proc_wait --
 141  *      Wait for one of the processes.
 142  *
 143  * !!!
 144  * The pid_t type varies in size from a short to a long depending on the
 145  * system.  It has to be cast into something or the standard promotion
 146  * rules get you.  I'm using a long based on the belief that nobody is
 147  * going to make it unsigned and it's unlikely to be a quad.
 148  *
 149  * PUBLIC: int proc_wait __P((SCR *, long, const char *, int, int));
 150  */
 151 int
 152 proc_wait(sp, pid, cmd, silent, okpipe)
 153         SCR *sp;
 154         long pid;
 155         const char *cmd;
 156         int silent, okpipe;
 157 {
 158         size_t len;
 159         int nf, pstat;
 160         char *p;
 161
 162         /* Wait for the utility, ignoring interruptions. */
 163         for (;;) {
 164                 errno = 0;
 165                 if (waitpid((pid_t)pid, &pstat, 0) != -1)
 166                         break;
 167                 if (errno != EINTR) {
 168                         msgq(sp, M_SYSERR, "waitpid");
 169                         return (1);
 170                 }
 171         }
 172
 173         /*
 174          * Display the utility's exit status.  Ignore SIGPIPE from the
 175          * parent-writer, as that only means that the utility chose to
 176          * exit before reading all of its input.
 177          */
 178         if (WIFSIGNALED(pstat) && (!okpipe || WTERMSIG(pstat) != SIGPIPE)) {
 179                 for (; isblank(*cmd); ++cmd);
 180                 p = msg_print(sp, cmd, &nf);
 181                 len = strlen(p);
 182                 msgq(sp, M_ERR, "%.*s%s: received signal: %s%s",
 183                     MIN(len, 20), p, len > 20 ? " ..." : "",
 184                     sigmsg(WTERMSIG(pstat)),
 185                     WCOREDUMP(pstat) ? "; core dumped" : "");
 186                 if (nf)
 187                         FREE_SPACE(sp, p, 0);
 188                 return (1);
 189         }
 190
 191         if (WIFEXITED(pstat) && WEXITSTATUS(pstat)) {
 192                 /*
 193                  * Remain silent for "normal" errors when doing shell file
 194                  * name expansions, they almost certainly indicate nothing
 195                  * more than a failure to match.
 196                  *
 197                  * Remain silent for vi read filter errors.  It's historic
 198                  * practice.
 199                  */
 200                 if (!silent) {
 201                         for (; isblank(*cmd); ++cmd);
 202                         p = msg_print(sp, cmd, &nf);
 203                         len = strlen(p);
 204                         msgq(sp, M_ERR, "%.*s%s: exited with status %d",
 205                             MIN(len, 20), p, len > 20 ? " ..." : "",
 206                             WEXITSTATUS(pstat));
 207                         if (nf)
 208                                 FREE_SPACE(sp, p, 0);
 209                 }
 210                 return (1);
 211         }
 212         return (0);
 213 }
 214
 215 /*
 216  * XXX
 217  * The sys_siglist[] table in the C library has this information, but there's
 218  * no portable way to get to it.  (Believe me, I tried.)
 219  */
 220 typedef struct _sigs {
 221         int      number;                /* signal number */
 222         char    *message;               /* related message */
 223 } SIGS;
 224
 225 SIGS const sigs[] = {
 226 #ifdef SIGABRT
 227         SIGABRT,        "Abort trap",
 228 #endif
 229 #ifdef SIGALRM
 230         SIGALRM,        "Alarm clock",
 231 #endif
 232 #ifdef SIGBUS
 233         SIGBUS,         "Bus error",
 234 #endif
 235 #ifdef SIGCLD
 236         SIGCLD,         "Child exited or stopped",
 237 #endif
 238 #ifdef SIGCHLD
 239         SIGCHLD,        "Child exited",
 240 #endif
 241 #ifdef SIGCONT
 242         SIGCONT,        "Continued",
 243 #endif
 244 #ifdef SIGDANGER
 245         SIGDANGER,      "System crash imminent",
 246 #endif
 247 #ifdef SIGEMT
 248         SIGEMT,         "EMT trap",
 249 #endif
 250 #ifdef SIGFPE
 251         SIGFPE,         "Floating point exception",
 252 #endif
 253 #ifdef SIGGRANT
 254         SIGGRANT,       "HFT monitor mode granted",
 255 #endif
 256 #ifdef SIGHUP
 257         SIGHUP,         "Hangup",
 258 #endif
 259 #ifdef SIGILL
 260         SIGILL,         "Illegal instruction",
 261 #endif
 262 #ifdef SIGINFO
 263         SIGINFO,        "Information request",
 264 #endif
 265 #ifdef SIGINT
 266         SIGINT,         "Interrupt",
 267 #endif
 268 #ifdef SIGIO
 269         SIGIO,          "I/O possible",
 270 #endif
 271 #ifdef SIGIOT
 272         SIGIOT,         "IOT trap",
 273 #endif
 274 #ifdef SIGKILL
 275         SIGKILL,        "Killed",
 276 #endif
 277 #ifdef SIGLOST
 278         SIGLOST,        "Record lock",
 279 #endif
 280 #ifdef SIGMIGRATE
 281         SIGMIGRATE,     "Migrate process to another CPU",
 282 #endif
 283 #ifdef SIGMSG
 284         SIGMSG,         "HFT input data pending",
 285 #endif
 286 #ifdef SIGPIPE
 287         SIGPIPE,        "Broken pipe",
 288 #endif
 289 #ifdef SIGPOLL
 290         SIGPOLL,        "I/O possible",
 291 #endif
 292 #ifdef SIGPRE
 293         SIGPRE,         "Programming error",
 294 #endif
 295 #ifdef SIGPROF
 296         SIGPROF,        "Profiling timer expired",
 297 #endif
 298 #ifdef SIGPWR
 299         SIGPWR,         "Power failure imminent",
 300 #endif
 301 #ifdef SIGRETRACT
 302         SIGRETRACT,     "HFT monitor mode retracted",
 303 #endif
 304 #ifdef SIGQUIT
 305         SIGQUIT,        "Quit",
 306 #endif
 307 #ifdef SIGSAK
 308         SIGSAK,         "Secure Attention Key",
 309 #endif
 310 #ifdef SIGSEGV
 311         SIGSEGV,        "Segmentation fault",
 312 #endif
 313 #ifdef SIGSOUND
 314         SIGSOUND,       "HFT sound sequence completed",
 315 #endif
 316 #ifdef SIGSTOP
 317         SIGSTOP,        "Suspended (signal)",
 318 #endif
 319 #ifdef SIGSYS
 320         SIGSYS,         "Bad system call",
 321 #endif
 322 #ifdef SIGTERM
 323         SIGTERM,        "Terminated",
 324 #endif
 325 #ifdef SIGTRAP
 326         SIGTRAP,        "Trace/BPT trap",
 327 #endif
 328 #ifdef SIGTSTP
 329         SIGTSTP,        "Suspended",
 330 #endif
 331 #ifdef SIGTTIN
 332         SIGTTIN,        "Stopped (tty input)",
 333 #endif
 334 #ifdef SIGTTOU
 335         SIGTTOU,        "Stopped (tty output)",
 336 #endif
 337 #ifdef SIGURG
 338         SIGURG,         "Urgent I/O condition",
 339 #endif
 340 #ifdef SIGUSR1
 341         SIGUSR1,        "User defined signal 1",
 342 #endif
 343 #ifdef SIGUSR2
 344         SIGUSR2,        "User defined signal 2",
 345 #endif
 346 #ifdef SIGVTALRM
 347         SIGVTALRM,      "Virtual timer expired",
 348 #endif
 349 #ifdef SIGWINCH
 350         SIGWINCH,       "Window size changes",
 351 #endif
 352 #ifdef SIGXCPU
 353         SIGXCPU,        "Cputime limit exceeded",
 354 #endif
 355 #ifdef SIGXFSZ
 356         SIGXFSZ,        "Filesize limit exceeded",
 357 #endif
 358 };
 359
 360 /*
 361  * sigmsg --
 362  *      Return a pointer to a message describing a signal.
 363  */
 364 static const char *
 365 sigmsg(signo)
 366         int signo;
 367 {
 368         static char buf[40];
 369         const SIGS *sigp;
 370         int n;
 371
 372         for (n = 0,
 373             sigp = &sigs[0]; n < sizeof(sigs) / sizeof(sigs[0]); ++n, ++sigp)
 374                 if (sigp->number == signo)
 375                         return (sigp->message);
 376         (void)snprintf(buf, sizeof(buf), "Unknown signal: %d", signo);
 377         return (buf);
 378 }